Replacing a one piece shower and tub is one of the most impactful renovations you can make to update a bathroom’s look and functionality. This single-unit fixture combines a tub and shower in a seamless design, making it a popular choice for homeowners seeking a low-maintenance, stylish solution. However, removing the old unit and installing a new one requires careful planning, the right tools, and attention to detail to ensure a watertight, safe installation.
Assessing Your Bathroom Layout
Before purchasing a new unit, you must evaluate the existing space to confirm the new fixture will fit. Measure the width and length of the current shower and tub area, paying close attention to the clearance needed for doors or hinges. Check the height of the new unit against the surrounding countertops and vanities to ensure comfortable access. If you are changing the layout, consider whether the drain location needs to be adjusted, as even a few inches can complicate the installation.
Preparing for the Replacement
Preparation is the key to a smooth replacement process. You will need to gather essential tools such as a reciprocating saw, utility knife, pry bar, tape measure, and a level. Turn off the water supply to the bathroom and verify that the shut-off valves are functioning properly. Place a thick towel or blanket over the tub ledge to prevent scratches during removal, and have a helper on standby, as these units are extremely heavy and difficult to maneuver alone.
Step-by-Step Removal Process
Removing the old fixture requires patience and caution to avoid damaging the surrounding walls or floor.
- Shut off the water and open the shower faucet to drain any remaining water from the pipes.
- Remove the access panel to reach the plumbing connections and disconnect the hot and cold water lines.
- Unscrew the drain assembly and carefully cut the caulking along the edges of the unit.
- Use a reciprocating saw to cut through the drywall or studs if the fixture is bonded to the wall.
- Gently rock the unit back and forth to break the seal, then lift it out with the help of a partner.
Inspecting and Preparing the New Unit
With the old unit removed, take the opportunity to inspect the subfloor and wall studs for any signs of water damage or mold. Clean the area thoroughly and ensure it is completely dry before proceeding. Unpack the new one piece shower and tub and compare it to the old measurements. Verify that the drain aligns with the existing waste pipe and that the faucet holes match the positioning of the new valves. Apply a fresh bead of waterproof caulk to the bottom edges of the new unit to create a moisture barrier before installation.
Installing the New Fixture
Lifting the new unit into place requires coordination and care. Slide the unit into the bay, ensuring the drain pipe slides through the waste opening without stress. Use a level to confirm the unit is perfectly straight, and shim underneath the corners if the floor is uneven. Reconnect the water supply lines to the faucet valves, tightening the connections firmly to prevent leaks. Install the drain assembly according to the manufacturer’s instructions, applying plumber’s tape to the threads for an extra seal. Finally, turn the water supply back on and test the unit for leaks by running the water for several minutes.
Finishing Touches and Sealing
The final steps are crucial for long-term durability and aesthetics. Once the fixtures are connected and the water is running, check all joints and seams for immediate leaks. Apply a fresh layer of grout and caulk where the unit meets the tile and the bathroom floor. This creates a watertight seal that prevents moisture from seeping behind the walls. Allow the caulk to cure fully before using the shower to ensure a strong, flexible bond that withstands temperature changes and daily use.
